Big Bend City(MN)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Big Bend City(MN) clear sky chart from 2005-11-06 to 2024-01-12.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	12% 8% 3 6% 6% 3 5% 5% 5% 7% 39%	74717
	Night	11% 8% 4 7% 6% 3 5% 5% 5% 7% 40%	75003
Transparency	Day	43% 5% 14% 25% 11% 1	74417
	Night	43% 5% 14% 24% 12% 2	74823
Seeing	Day	16% 8% 29% 30% 15% 3	14837
	Night	15% 7% 31% 35% 11% 1	24869

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	8% 10% 6% 10% 8% 5% 6% 4 6% 7% 29%	1328
	11th to 20th	Day	10% 13% 6% 11% 7% 5% 4 5% 6% 7% 25%	1450
	21st to end	Day	9% 12% 6% 10% 11% 5% 8% 6% 7% 8% 19%	1782
February	1st to 10th	Day	8% 11% 6% 7% 8% 4 7% 8% 6% 8% 27%	1620
	11th to 20th	Day	7% 11% 5% 9% 9% 5% 8% 7% 5% 6% 27%	1574
	21st to end	Day	9% 12% 5% 10% 10% 5% 6% 4 6% 8% 25%	1417
March	1st to 10th	Day	12% 11% 5% 8% 8% 3 5% 4 4 7% 31%	1927
	11th to 20th	Day	13% 12% 4 8% 5% 3 5% 5% 5% 7% 33%	1980
	21st to end	Day	18% 11% 4 8% 7% 4 5% 4 5% 6% 25%	2178
April	1st to 10th	Day	17% 9% 2 6% 5% 2 4 5% 6% 8% 37%	2083
	11th to 20th	Day	20% 12% 4 6% 5% 3 4 4 4 6% 33%	2291
	21st to end	Day	22% 9% 3 6% 6% 3 4 4 5% 6% 33%	2340
May	1st to 10th	Day	17% 8% 4 6% 7% 3 4 4 5% 7% 36%	2340
	11th to 20th	Day	17% 7% 2 5% 5% 3 4 5% 5% 8% 38%	2439
	21st to end	Day	14% 6% 3 7% 5% 3 5% 5% 6% 8% 38%	2725
June	1st to 10th	Day	12% 4 2 5% 5% 3 4 5% 6% 8% 45%	2659
	11th to 20th	Day	13% 6% 3 5% 5% 4 5% 6% 5% 8% 41%	2700
	21st to end	Day	8% 4 2 5% 5% 3 4 5% 7% 10% 48%	2700
July	1st to 10th	Day	6% 3 2 4 4 3 4 5% 7% 9% 54%	2700
	11th to 20th	Day	6% 3 2 4 5% 2 4 4 6% 8% 56%	2697
	21st to end	Day	5% 4 2 4 4 3 4 6% 7% 9% 53%	2554
August	1st to 10th	Day	8% 4 2 4 6% 4 5% 6% 7% 9% 44%	2328
	11th to 20th	Day	11% 5% 2 5% 5% 3 5% 5% 5% 8% 47%	2301
	21st to end	Day	8% 3 2 4 4 2 4 4 5% 7% 57%	2570
September	1st to 10th	Day	11% 4 2 4 4 3 4 3 5% 7% 53%	2160
	11th to 20th	Day	11% 4 2 4 5% 3 5% 5% 6% 8% 46%	1982
	21st to end	Day	16% 5% 2 4 4 2 4 4 5% 7% 49%	1980
October	1st to 10th	Day	16% 6% 3 5% 5% 3 4 4 5% 6% 43%	1810
	11th to 20th	Day	16% 9% 2 5% 4 2 4 4 5% 6% 43%	1800
	21st to end	Day	18% 8% 4 5% 4 3 4 4 5% 6% 40%	1916
November	1st to 10th	Day	12% 9% 3 7% 5% 3 3 4 5% 7% 41%	1593
	11th to 20th	Day	9% 10% 6% 11% 9% 4 5% 5% 4 7% 31%	1520
	21st to end	Day	13% 9% 5% 8% 7% 3 4 4 5% 7% 36%	1520
December	1st to 10th	Day	8% 11% 6% 9% 9% 4 7% 6% 5% 7% 28%	1520
	11th to 20th	Day	10% 14% 6% 10% 8% 3 5% 5% 5% 7% 27%	1791
	21st to end	Day	21% 13% 5% 13% 8% 3 3 4 4 5% 21%	2442
January	1st to 10th	Night	6% 9% 5% 9% 8% 4 5% 6% 6% 8% 33%	2837
	11th to 20th	Night	7% 12% 6% 12% 9% 5% 7% 6% 6% 6% 24%	2528
	21st to end	Night	11% 13% 4 10% 7% 4 6% 5% 7% 7% 26%	2574
February	1st to 10th	Night	6% 11% 5% 10% 8% 4 6% 6% 5% 8% 32%	2340
	11th to 20th	Night	7% 9% 4 8% 7% 4 6% 6% 6% 8% 36%	2273
	21st to end	Night	11% 10% 4 7% 7% 4 6% 6% 6% 6% 33%	1855
March	1st to 10th	Night	11% 9% 4 8% 6% 4 5% 4 5% 6% 38%	2032
	11th to 20th	Night	13% 10% 3 7% 5% 2 4 5% 4 7% 40%	1980
	21st to end	Night	16% 9% 4 8% 6% 3 4 5% 5% 7% 33%	2178
April	1st to 10th	Night	15% 10% 3 5% 5% 3 4 4 6% 8% 39%	1876
	11th to 20th	Night	17% 10% 5% 6% 4 3 5% 4 4 5% 36%	1617
	21st to end	Night	19% 7% 3 6% 5% 3 5% 5% 4 6% 38%	1620
May	1st to 10th	Night	16% 7% 3 6% 6% 3 4 4 5% 7% 41%	1620
	11th to 20th	Night	13% 7% 3 4 4 4 4 5% 6% 9% 42%	1453
	21st to end	Night	13% 5% 2 5% 5% 3 5% 6% 6% 9% 41%	1551
June	1st to 10th	Night	9% 4 3 4 4 3 4 5% 5% 8% 51%	1296
	11th to 20th	Night	9% 4 2 4 4 3 4 5% 5% 7% 53%	1260
	21st to end	Night	7% 3 2 3 4 3 3 4 5% 7% 59%	1260
July	1st to 10th	Night	4 3 1 3 3 3 4 4 7% 10% 57%	1260
	11th to 20th	Night	3 2 1 2 3 2 3 5% 6% 8% 64%	1260
	21st to end	Night	4 2 2 3 4 3 4 5% 6% 9% 58%	1761
August	1st to 10th	Night	6% 6% 2 5% 5% 3 5% 5% 5% 8% 50%	1611
	11th to 20th	Night	9% 4 2 4 3 2 4 4 4 6% 59%	1600
	21st to end	Night	5% 3 1 4 3 2 3 4 5% 7% 65%	1786
September	1st to 10th	Night	9% 4 2 3 3 3 4 4 5% 8% 57%	1800
	11th to 20th	Night	10% 5% 3 4 4 3 4 3 5% 6% 54%	1975
	21st to end	Night	11% 6% 2 5% 4 2 3 2 5% 5% 55%	1980
October	1st to 10th	Night	15% 6% 2 5% 5% 2 4 3 4 7% 47%	2132
	11th to 20th	Night	15% 8% 3 4 4 3 4 4 5% 6% 45%	2160
	21st to end	Night	16% 8% 4 6% 4 2 4 3 5% 7% 41%	2438
November	1st to 10th	Night	10% 8% 3 6% 5% 3 4 5% 6% 8% 42%	2484
	11th to 20th	Night	11% 9% 5% 9% 7% 4 4 4 4 6% 37%	2660
	21st to end	Night	10% 10% 4 6% 6% 3 4 5% 5% 7% 39%	2660
December	1st to 10th	Night	8% 11% 5% 9% 8% 5% 5% 5% 5% 7% 31%	2660
	11th to 20th	Night	11% 10% 5% 9% 8% 4 5% 5% 6% 8% 29%	3401
	21st to end	Night	20% 13% 6% 11% 7% 4 5% 5% 4 5% 21%	5225

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	53% 5% 18% 17% 6% 1	1329
	11th to 20th	Day	58% 3 15% 16% 7%	1450
	21st to end	Day	61% 5% 15% 13% 5%	1782
February	1st to 10th	Day	54% 5% 14% 21% 7%	1620
	11th to 20th	Day	56% 5% 13% 18% 7% 1	1583
	21st to end	Day	57% 6% 13% 15% 9%	1417
March	1st to 10th	Day	54% 5% 16% 18% 7% 1	1927
	11th to 20th	Day	52% 5% 14% 22% 7%	1980
	21st to end	Day	58% 4 13% 19% 5%	2178
April	1st to 10th	Day	46% 5% 13% 25% 11% 1	2083
	11th to 20th	Day	53% 4 9% 19% 13% 1	2291
	21st to end	Day	52% 4 11% 24% 8% 1	2340
May	1st to 10th	Day	49% 4 11% 24% 12% 1	2340
	11th to 20th	Day	44% 5% 13% 24% 13% 1	2443
	21st to end	Day	43% 6% 13% 25% 12% 2	2725
June	1st to 10th	Day	36% 5% 16% 30% 12% 1	2659
	11th to 20th	Day	40% 6% 13% 24% 15% 2	2700
	21st to end	Day	30% 6% 18% 30% 14% 2	2700
July	1st to 10th	Day	24% 6% 17% 33% 18% 1	2626
	11th to 20th	Day	25% 6% 15% 30% 20% 4	2616
	21st to end	Day	26% 6% 16% 32% 18% 2	2412
August	1st to 10th	Day	35% 7% 15% 29% 11% 4	2314
	11th to 20th	Day	34% 6% 16% 31% 11% 2	2301
	21st to end	Day	26% 5% 14% 34% 18% 3	2570
September	1st to 10th	Day	31% 5% 12% 36% 15% 1	2160
	11th to 20th	Day	34% 5% 17% 32% 11% 1	1982
	21st to end	Day	36% 4 13% 31% 15% 1	1980
October	1st to 10th	Day	41% 4 13% 27% 14% 1	1810
	11th to 20th	Day	40% 5% 11% 27% 14% 2	1800
	21st to end	Day	45% 4 13% 27% 10% 1	1916
November	1st to 10th	Day	43% 5% 13% 24% 12% 3	1593
	11th to 20th	Day	53% 5% 12% 20% 8%	1520
	21st to end	Day	47% 5% 16% 21% 8% 2	1520
December	1st to 10th	Day	54% 6% 14% 17% 7%	1520
	11th to 20th	Day	55% 8% 16% 16% 5%	1788
	21st to end	Day	63% 5% 12% 14% 5%	2442
January	1st to 10th	Night	48% 5% 16% 22% 9%	2837
	11th to 20th	Night	58% 6% 13% 15% 7%	2528
	21st to end	Night	56% 5% 13% 18% 8% 1	2574
February	1st to 10th	Night	50% 5% 15% 19% 10% 1	2340
	11th to 20th	Night	46% 6% 14% 21% 12% 1	2274
	21st to end	Night	51% 5% 11% 19% 12% 2	1855
March	1st to 10th	Night	47% 5% 16% 23% 8% 1	2032
	11th to 20th	Night	46% 3 13% 26% 11%	1980
	21st to end	Night	51% 4 14% 23% 7% 1	2178
April	1st to 10th	Night	44% 4 13% 27% 11% 1	1876
	11th to 20th	Night	50% 4 6% 23% 13% 3	1617
	21st to end	Night	48% 5% 10% 23% 12% 2	1620
May	1st to 10th	Night	43% 5% 12% 26% 14% 1	1620
	11th to 20th	Night	39% 6% 11% 26% 16% 3	1454
	21st to end	Night	39% 7% 13% 23% 15% 3	1552
June	1st to 10th	Night	29% 5% 14% 32% 17% 2	1296
	11th to 20th	Night	29% 5% 18% 28% 17% 3	1260
	21st to end	Night	25% 4 17% 31% 19% 3	1260
July	1st to 10th	Night	20% 6% 16% 35% 20% 2	1225
	11th to 20th	Night	17% 5% 14% 38% 21% 6%	1218
	21st to end	Night	22% 5% 16% 36% 18% 3	1663
August	1st to 10th	Night	31% 6% 14% 31% 14% 4	1601
	11th to 20th	Night	27% 5% 16% 35% 14% 2	1600
	21st to end	Night	21% 5% 13% 34% 23% 4	1786
September	1st to 10th	Night	27% 5% 14% 32% 20% 1	1800
	11th to 20th	Night	31% 4 14% 32% 18% 1	1975
	21st to end	Night	32% 4 12% 32% 19% 1	1980
October	1st to 10th	Night	39% 4 10% 28% 17% 2	2132
	11th to 20th	Night	40% 3 12% 28% 15% 2	2160
	21st to end	Night	44% 3 12% 26% 13% 1	2438
November	1st to 10th	Night	39% 5% 15% 24% 16% 2	2484
	11th to 20th	Night	48% 5% 13% 21% 12% 1	2660
	21st to end	Night	44% 5% 18% 23% 9% 1	2660
December	1st to 10th	Night	51% 5% 16% 20% 8%	2660
	11th to 20th	Night	51% 6% 19% 18% 5%	3403
	21st to end	Night	64% 7% 9% 15% 4	5225

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	14% 7% 29% 31% 15% 4	270
	11th to 20th	Day	17% 9% 24% 36% 11% 2	243
	21st to end	Day	19% 6% 38% 26% 11% 1	264
February	1st to 10th	Day	12% 14% 39% 31% 4	240
	11th to 20th	Day	16% 13% 35% 28% 7%	240
	21st to end	Day	17% 9% 33% 32% 8% 1	198
March	1st to 10th	Day	20% 8% 36% 27% 9%	240
	11th to 20th	Day	22% 6% 34% 28% 9% 1	240
	21st to end	Day	25% 8% 26% 27% 10% 4	264
April	1st to 10th	Day	28% 12% 29% 23% 7%	343
	11th to 20th	Day	28% 14% 24% 22% 11% 1	569
	21st to end	Day	24% 11% 31% 23% 10% 2	600
May	1st to 10th	Day	19% 10% 33% 26% 10% 1	603
	11th to 20th	Day	23% 9% 28% 24% 13% 3	625
	21st to end	Day	15% 7% 28% 33% 13% 4	679
June	1st to 10th	Day	10% 6% 23% 36% 21% 3	630
	11th to 20th	Day	14% 8% 34% 28% 13% 3	630
	21st to end	Day	9% 5% 31% 33% 17% 4	630
July	1st to 10th	Day	8% 2 22% 35% 27% 6%	621
	11th to 20th	Day	8% 6% 26% 36% 19% 5%	618
	21st to end	Day	6% 3 25% 38% 22% 5%	684
August	1st to 10th	Day	9% 3 19% 38% 26% 5%	626
	11th to 20th	Day	15% 3 17% 34% 23% 7%	615
	21st to end	Day	8% 3 28% 31% 24% 7%	689
September	1st to 10th	Day	13% 5% 27% 33% 17% 5%	450
	11th to 20th	Day	13% 2 32% 31% 18% 5%	272
	21st to end	Day	21% 11% 26% 26% 13% 3	270
October	1st to 10th	Day	18% 9% 30% 26% 13% 4	270
	11th to 20th	Day	18% 16% 32% 23% 10% 2	270
	21st to end	Day	22% 13% 34% 22% 8% 1	297
November	1st to 10th	Day	23% 7% 27% 31% 9% 1	270
	11th to 20th	Day	15% 14% 39% 26% 6% 1	270
	21st to end	Day	21% 15% 31% 22% 10%	270
December	1st to 10th	Day	10% 7% 40% 28% 13% 1	270
	11th to 20th	Day	16% 9% 39% 29% 9%	270
	21st to end	Day	30% 9% 30% 24% 7%	297
January	1st to 10th	Night	11% 8% 35% 34% 10% 1	950
	11th to 20th	Night	15% 9% 29% 37% 9% 1	906
	21st to end	Night	18% 8% 33% 33% 7% 1	990
February	1st to 10th	Night	12% 9% 37% 32% 9% 1	900
	11th to 20th	Night	12% 10% 36% 30% 10% 1	879
	21st to end	Night	17% 10% 30% 31% 11% 1	671
March	1st to 10th	Night	16% 7% 36% 31% 10% 1	592
	11th to 20th	Night	18% 8% 34% 34% 6% 1	540
	21st to end	Night	19% 7% 30% 30% 11% 2	594
April	1st to 10th	Night	20% 9% 36% 28% 6%	540
	11th to 20th	Night	23% 11% 27% 29% 9% 1	533
	21st to end	Night	23% 5% 30% 32% 9% 1	540
May	1st to 10th	Night	19% 7% 32% 33% 9% 1	540
	11th to 20th	Night	18% 5% 31% 34% 11% 1	531
	21st to end	Night	15% 6% 29% 37% 12% 1	584
June	1st to 10th	Night	11% 5% 24% 41% 17% 1	540
	11th to 20th	Night	11% 4 34% 43% 9%	540
	21st to end	Night	9% 3 25% 49% 13% 1	540
July	1st to 10th	Night	6% 2 19% 48% 24% 1	525
	11th to 20th	Night	6% 2 26% 48% 17% 1	522
	21st to end	Night	5% 1 24% 49% 20% 2	591
August	1st to 10th	Night	9% 1 18% 49% 20% 2	537
	11th to 20th	Night	10% 2 16% 45% 23% 4	534
	21st to end	Night	6% 2 23% 46% 21% 2	594
September	1st to 10th	Night	11% 2 28% 40% 18% 2	540
	11th to 20th	Night	12% 4 29% 37% 17% 1	540
	21st to end	Night	14% 5% 33% 34% 13% 1	540
October	1st to 10th	Night	18% 7% 32% 31% 11% 1	692
	11th to 20th	Night	21% 8% 33% 29% 9%	720
	21st to end	Night	21% 9% 31% 31% 7%	854
November	1st to 10th	Night	16% 8% 33% 32% 11%	925
	11th to 20th	Night	15% 9% 36% 29% 9% 1	950
	21st to end	Night	15% 12% 34% 31% 9%	950
December	1st to 10th	Night	14% 8% 34% 34% 10% 1	950
	11th to 20th	Night	20% 6% 30% 35% 8% 1	950
	21st to end	Night	26% 8% 31% 28% 7% 1	1045

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